Abstract
Machining of aerospace alloy such as nimonic 263 is a challenging task due to its intrinsic characteristics. In this study, the effect of Severe Plastic Deformation (SPD) through machining on its inherent characteristics such as young modulus, bulk modulus, etc have been investigated. The machining has been done using vertical machining center with the help of tungsten carbide tool with PVD coated TiAlN. X-ray diffraction line profile analysis is used to determine the changes in crystallite size and dislocation density on deformed samples through machining. Furthermore, ultrasonic wave method through pulse echo technique has confirmed the changes in elastic constants and lattice stability of machined samples, due to Severe Plastic Deformation (SPD) on machined sample. Quantitative contributions of machining parameter, tool nomenclature effect on surface modification, elastic constants and intrinsic characteristics of machined sample are evaluated and found that the machining have exposed a significant enhancement in elastic constants and hardness compared to the nascent sample. Further, it reveals that the tool nomenclature has a higher influence on the enhancement in material properties followed by machining parameter. The results portray that the significant contribution comes from dislocation density and disorder followed by crystallite size.
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